rock and roll, variety of well-liked audio that originated in America within the mid-nineteen fifties Which advanced via the mid-1960s into the more encompassing Global style called rock tunes, though the latter also continued to become generally known as rock and roll.

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rock, in geology, Normally happening and coherent mixture of one or more minerals. This sort of aggregates constitute The fundamental unit of which the sound Earth is composed and generally kind recognizable and mappable volumes. Rocks are commonly divided into three significant classes in accordance with the procedures that resulted inside their formation. These classes are (one) igneous rocks, that have solidified from molten content termed magma; (two) sedimentary rocks, All those consisting of fragments derived from preexisting rocks or of resources precipitated from remedies; and (3) metamorphic rocks, that have been derived from both igneous or sedimentary rocks below circumstances that brought on changes in mineralogical composition, texture, and interior framework.

Physical Houses of rocks are of interest and utility in lots of fields of work, including geology, petrophysics, geophysics, products science, geochemistry, and geotechnical engineering. The scale of investigation ranges with the molecular and crystalline up to terrestrial studies on the Earth and various planetary bodies. Geologists are interested in the radioactive age relationship of rocks to reconstruct the origin of mineral deposits; seismologists formulate possible earthquake predictions making use of premonitory Actual physical or chemical improvements; crystallographers research the synthesis of minerals with special optical or physical properties; exploration geophysicists look into the variation of Actual physical Qualities of subsurface rocks to produce possible detection of normal sources which include oil and gas, geothermal Electricity, and ores of metals; geotechnical engineers examine the nature and conduct of the products on, in, or of which this sort of constructions as properties, dams, tunnels, bridges, and underground storage vaults are to become created; good-state physicists research the magnetic, electrical, and mechanical Homes of components for electronic devices, Pc factors, or higher-functionality ceramics; and petroleum reservoir engineers review the reaction measured on nicely logs or from the procedures of deep drilling at elevated temperature and strain.

Due to the fact metamorphism signifies a reaction to switching physical circumstances, Individuals locations of Earth’s area in which dynamic procedures are most Lively may also be regions in which metamorphic procedures are most rigorous and easily noticed. The broad area with the Pacific margin, one example is, with its seismic and volcanic exercise, is usually a place by which products are now being buried and metamorphosed intensely.

Presley’s quick increase to nationwide stardom exposed The brand new cultural and economic electric power of the two teenagers and teenage-aimed media—records, radio, television, and movement pictures.

Metamorphic rocks are Individuals formed by adjustments in preexisting rocks beneath the affect of higher temperature, tension, and chemically active options. The adjustments can be chemical (compositional) and physical (textural) in character. Metamorphic a knockout post rocks are often shaped by processes deep inside the Earth that generate new minerals, textures, and crystal structures. The recrystallization that will take put does so fundamentally in the solid condition, rather then by comprehensive remelting, and may be aided by ductile deformation as well as the presence of interstitial fluids like h2o.

Geologic elements—mineral crystals and their host rock kinds—are cycled as a result of different sorts. The procedure depends upon temperature, pressure, time, and variations in environmental situations in the Earth’s crust and at its floor. The rock cycle illustrated in Figure one reflects The fundamental relationships amid igneous, metamorphic, and sedimentary rocks.

Metamorphism typically creates obvious layering, or banding, as a result of segregation of minerals into different bands. Metamorphic procedures might also manifest in the Earth’s surface on account of meteorite impression gatherings and pyrometamorphism occurring around burning coal seams ignited by lightning strikes.

Encyclopaedia Britannica's editors oversee subject matter spots in which they've substantial expertise, no matter if from a long time of working experience attained by engaged on that written content or by using analyze for a complicated diploma. They produce new information and confirm and edit articles acquired from contributors.